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We narrowed to 304 results for: cas9

Showing: 41 - 60 of 304 results

  1. Comparing Cas9 to NgAgo: Can the Argonautes Best CRISPR?

    Type
    Blog Post
    ...lines, with an efficiency similar to that of Cas9. Like Cas9, NgAgo is also able to mediate homology-directed...at Addgene Cas9 and NgAgo head to head NgAgo has a number of unique features compared to Cas9. These include...the Addgene Blog Read About Cas9 Homolog Cpf1 Check Out High Fidelty Cas9 Mutants Browse All Genome Engineering... why you might choose NgAgo over CRISPR proteins Cas9 or Cpf1 - keep reading to learn more! Background...include: More targeting flexibility Unlike Cas9 and the other CRISPR enzymes, NgAgo does not require a...genomic target. NgAgo also appears to outperform Cas9 in GC-rich regions. DNA guides NgAgo uses 5’ phosphorylated... “gDNAs”) rather than the RNA guides employed by Cas9 or Cpf1. These short, 24 base DNA guides may be ...

  2. Using CRISPR/Cas9 to Edit Disease Out of the Genome

    Type
    Blog Post
    ...Northeastern University.  There can be no doubt that CRISPR/Cas9 technology has been a breakthrough for the genome-editing...lab are researching a way to treat AD using CRISPR/Cas9. They are targeting the genes responsible for both... AD. In this study, the group showed that CRISPR/Cas9 could be used to edit several autosomal-dominant...that play into late onset AD (5).     CRISPR/Cas9 corrects Alzheimer’s disease mutation in basal forebrain... could be rescued by coinjection into zygotes of Cas9 mRNA and a single-guide RNA targeting the mutant...Hubrecht Institute in The Netherlands used the CRISPR/Cas9 genome editing system to correct the cystic fibrosis...cystic fibrosis (8).   The difference with CRISPR/Cas9 in comparison to other genome editing techniques...

  3. Genome-wide Screening Using CRISPR

    Type
    Blog Post
    ...CRISPR/Cas9 over previous genome editing techniques is its simplicity and versatility. CRISPR/Cas9 consists...in which Cas9 is included on the gRNA-containing plasmid, or a 2-plasmid system in which Cas9 must be ...of two components: the non-specific endonuclease (Cas9) and a single stranded guide RNA (gRNA). The ~20...the user, and it can be easily modified to target Cas9 to virtually any genomic locus, provided the target...adjacent motif (PAM) sequence. Co-delivery of wild-type Cas9 and a gRNA generates a double-strand break in the...genomic target. The goal of a CRISPR screen is to use Cas9 and a pool of gRNAs to identify genes that are essential...lentivirus to deliver a pooled population of gRNAs to Cas9 expressing cells. Pooled lentiviral CRISPR libraries...

  4. Even more elegant: Single injection CRISPR/Cas9 in C. elegans

    Type
    Blog Post
    ...for CRISPR/Cas9 editing in C. elegans: Engineering the Caenorhabditis elegans genome using Cas9-triggered...2013, a remarkable nine papers describing CRISPR/Cas9 genome engineering methods for C. elegans were released...Multiple features of C. elegans have made CRISPR/Cas9 so successful in this species, namely, the robust...create a new and efficient selection-based CRISPR/Cas9 method to generate knock-ins on any genetic background...3xFLAG-tag fusion proteins. The repair template and Cas9-sgRNA plasmid is then injected into the germline...species or in cell culture. In addition to CRISPR/Cas9 applications, SEC selection could replace other,...system represents another leap forward for the CRISPR/Cas9 revolution!   References Streamlined Genome Engineering...

  5. Nanoblades: Tiny CRISPR Ninjas for Genome Editing Difficult Cells

    Type
    Blog Post
    ...releasing Cas9. Nanoblades can also deliver Cas9 variants, such as a transcriptional activator dCas9-VPR, ...Nanoblades by association with the the Cas9 portion of the Gag-Cas9 fusion protein. A single Nanoblade particle...along with the gRNA and Cas9. An “all-in-one” Nanoblades which carries a gRNA, Cas9, and a HDR donor template...centrifugation. Gag-Cas9 fusion protein The MLV Gag protein fused to a Flag-tagged SpCas9 is incorporated ... leukemia virus (MLV)-like particles loaded with Cas9-gRNA ribonucleoproteins (RNPs). According to the...generation. Key components of Nanoblades Nanoblades are a Cas9 RNP delivery vehicle that’s based on mouse leukemia...just like the unmodified MLV Gag protein. After Gag-Cas9 is incorporated, the MLV protease, supplied as part...

  6. CRISPR 101: Mammalian Expression Systems and Delivery Methods

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    Blog Post
    ... CRISPR tools for your application: Wildtype Cas9 or Cas9 nickase are appropriate for generating knockouts...in vivo viral delivery. Cas9 mRNA and gRNA Plasmids containing gRNA and Cas9 are used in in vitro transcription...generating transgenic embryos. Cas9-gRNA ribonucleoprotein complexes Purified Cas9 protein and in vitro transcribed...need to deliver. Minimally, one or more sgRNAs and Cas9 are required for any application. If you want to...Application Mammalian expression vector Promoter driving Cas9 expression can be constitutive or inducible. U6 ...stable cell lines. Transient or stable expression of Cas9 and/or gRNA in a mammalian cell line that can be...transfected at high efficiency. Lentiviral transduction Cas9 and gRNA can be present in a single lentiviral transfer...

  7. Four Base Editing Reporters to Monitor and Enrich Editing in Real-time

    Type
    Blog Post
    ...single base editing by APOBEC-Cas9 Though the ACE reporter quantifies APOBEC-Cas9 efficiency in real-time, ...and enrichment of DNA editing by APOBEC–Cas9 or cleavage by Cas9 in living cells. Nucleic Acids Research... a APOBEC-Cas9n-UGI complex. So how exactly does this work? Figure 1: APOBEC- and Cas9-mediated ...genome, but they’re inefficient compared to CRISPR/Cas9 edits that rely on double strand DNA breaks. Due...can help you do just that. Monitoring APOBEC and Cas9-mediated editing in real time The Harris lab created...APOBEC (a family of cytidine deaminase proteins) and Cas9-mediated editing in real time (St. Martin et al....quantify the on-target DNA editing efficiency of APOBEC-Cas9 editisome complexes in real-time (St. Martin et ...

  8. CRISPR 101: Anti-CRISPR Proteins Switch Off CRISPR-Cas Systems

    Type
    Blog Post
    ...et al., 2016). While Streptococcus pyogenes Cas9 (SpyCas9) is the most used and well studied CRISPR system... study, the labs found that anti-CRISPR prevents Cas9 activity in HEK293 by reducing editing from ~30%...interact with CRISPR-Cas systems such as Cascade-Cas3, Cas9, Cas12, and Cas13 (Marino et al., 2020). Some Acr...ways: Inhibit DNA binding Example:  AcrIIA4 blocks Cas9’s interaction with the PAM site (Dong et al., 2017... crRNA loadingExample: AcrIIC2 interactions with Cas9 interferes and prevents the correct assembly of ... AcrIIC1 binds to the HNH endonuclease domain of Cas9 and prevents target DNA cleavage (Harrington et ... Doudna lab found that at least 50% of on-target Cas9 edits happens within the first six hours. When added...

  9. Zebrafish Plasmid Collection

    Type
    Collection
    ...Lab CRISPR/Cas9-based conditional mutagenesis in zebrafish - Wenbiao Chen Lab A CRISPR/Cas9 Vector System...modified CRISPR-Cas9 system - Shuo Lin Lab Re-purposed Ac/Ds transgenic system enabling CRISPR/dCas9-interference...morpholinos, zinc finger nucleases, TALENS, and CRISPR/Cas9-based gene editing make the zebrafish a stalwart...resources for a full selection of plasmids expressing Cas9 and empty gRNA backbones. A few examples of useful...GeneWeld Vectors for Targeted Integration Using CRISPR/Cas9 - Jeffrey Essner Lab CRISPR-Cas/RNA-Guided Nuclease...use of zebrafish. CRISPRz - A database of CRISPR/Cas9 target sequences that have been experimentally validated...

  10. CRISPR 101: Non-Homologous End Joining

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    Blog Post
    .... Repair of Cas9-induced breaks by NHEJ As illustrated below, NHEJ-mediated repair of Cas9-generated breaks...Cas system for genome engineering is the fact that Cas9 can be easily programmed to make a DNA double strand...discuss NHEJ, and how it impacts what happens to Cas9-mediated DSBs in the genome. Non-homologous end...consequently the principal means by which CRISPR/Cas9-introduced breaks are repaired. The following factors...introduce indels. Given the end structure of the Cas9 DSB (blunt or near-blunt ends without nucleotide...population of cells constitutively expressing a targeted Cas9 should possess indels in the majority of their chromosomes...Another factor expected to impact repair is that the Cas9 protein doesn’t immediately release from the broken...

  11. CRISPR 101: Engineering the Plant Genome Using CRISPR/Cas9

    Type
    Blog Post
    ...expression of S. pyogenes Cas9 or Cas9 variants (hereafter referred to as Cas9) and a single stranded guide... gRNA backbones also contain Cas9, which enables expression of both Cas9 and the gRNA off of the same ...Nuclease dead Cas9 (dCas9) based activators (such as dCas9-VP64) or repressors (dCas9-KRAB or dCas9-SRDX) can...get more information on multiplexing gRNAs here). Cas9 is commonly tagged with a nuclear localization sequence...targeting to the nucleus, and several codon optimized Cas9 variants have been created in an effort to increase...repress target genes in plant cells, respectively. Cas9 expression is commonly driven by plant-derived RNA...Examples of commonly used RNA pol II promoters for Cas9 expression include the ubiquitously expressing cauliflower...

  12. Lentiviral CRISPR Libraries Enable Genome-Scale, Knockout Screening

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    Blog Post
    ...It’s clear that CRISPR-Cas9 technology has really changed the game for anyone looking to quickly and ...Lander library uses sequential infection first of Cas9, then with the sgRNAs, and can result in a higher...that have previously been stably transfected for Cas9 expression. The Yusa lab has used their library ...application offer proof-of-principle that CRISPR-Cas9 can be used to target any sequence in the genome... Genetic Screens in Human Cells Using the CRISPR/Cas9 System. Wang T, Wei JJ, Sabatini DM, Lander ES. ...Science. 2013 Dec 12. (PubMed). Genome-Scale CRISPR-Cas9 Knockout Screening in Human Cells. Shalem O, Sanjana... crispr/cas9...

  13. Google Forums Round Up: First Impressions of NgAgo

    Type
    Blog Post
    ... preassembled Cas9/gRNA complexes or with guide RNA- and Cas9-expression plasmids. Cas9 guide RNA delivery...genome, which seem resistant to Cas9 cleavage (1). Both the CRISPR-Cas9 and NgAgo genome engineering methods...Targeting Specificity with eSpCas9 and SpCas9-HF1 See How Cpf1 Stacks Up to Cas9 and NgAgo Resources on ...engineer sharing the stage with much-lauded CRISPR-Cas9 is DNA-guided endonuclease NgAgo! We'll discuss ...head-to-head.  Exciting features of NgAgo First, unlike Cas9, NgAgo does not require a PAM sequence for target... guide sequence rather than an RNA guide as with Cas9. Third, it can be used to target “difficult” GC-...the other hand, the widespread success of CRISPR-Cas9 across multiple model organisms (3) lies in the ...

  14. Cpf1 Update: Comparison to Cas9 and NgAgo

    Type
    Blog Post
    ...overcome some of Cas9’s shortcomings. Cpf1’s preferred PAM is 5’-TTN, differing from that of Cas9 (3’-NGG) in...than that of the widely used SpCas9 and comparable to SaCas9. As seen with Cas9 orthologs, Cpf1 efficiency...rate is similar to that of high fidelity Cas9s eSpCas9 and SpCas9-HF1. Both AsCpf1 and LbCpf1 ribonucleoproteins...two Cpf1 nucleases, distant cousins of well-known Cas9. Cpf1 cleaves DNA in a staggered pattern and requires...rather than the two (tracrRNA and crRNA) needed by Cas9 for cleavage. Now, two new studies show that Cpf1...Cpf1 displays lower off-target editing than Cas9, confirming that this protein is well suited for genome...advantages of Cpf1 Type II CRISPR systems based on Cas9 were thought to be the simplest CRISPR systems and...

  15. Unique and persistent IDs for improved reproducibility: Addgene now supports RRIDs and compact identifiers for all plasmids

    Type
    Blog Post
    ...lenti-Cas9-VQR plasmid page. Despite their differences, both of these PID formats for lenti-Cas9-VQR contain...available through Addgene. Let’s take a look at lenti-Cas9-VQR-Blast, which has the Addgene ID #87155. The ...The resolvable compact identifier format for lenti-Cas9-VQR is the URL “http://n2t.net/addgene:87155” where...n2t.net web address. For the RRID format, lenti-Cas9-VQR is represented as “RRID:Addgene_87155” and the...formats. Let’s go back to our example plasmid, lenti-Cas9-VQR-Blast. If you scroll down to the bottom of this...semi-colons. For our example plasmid it will read “lenti-Cas9-VQR-Blast was a gift from Daniel Bauer (Addgene ... a resolvable compact identifier and RRID “lenti-Cas9-VQR-Blast was a gift from Daniel Bauer (Addgene ...

  16. Giving gRNAs a Facelift - Synthetic and Beyond

    Type
    Blog Post
    ...surprise then that stability of the RNA used in CRISPR-Cas9 experiments – the “gRNA” – suffers from the same...still effectively serving their function of guiding Cas9 to generate a targeted break. These advances in ...modifications The recognition sequence for CRISPR-Cas9 targeting is led by a ~20 bp gRNA which is part ...trans-activating crRNA (tracrRNA) which interacts with the Cas9 protein. These RNA molecules are vulnerable to attack...partially DNA gRNA is surprisingly well-tolerated by the Cas9 protein and can increase on-target efficiency. In...modifications listed above were developed before CRISPR-Cas9, for use in applications like siRNA and antisense...On-off switches for gRNAs A major drawback of CRISPR-Cas9 technology is that most expression systems are constantly...

  17. Hassle-free 96-well Format Epitope Tagging Using Cas9 Ribonucleoprotein

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    Blog Post
    ... Figure 2: Cas9 RNP complexed with 2-part cr:tracrRNA tags genes more effectively than Cas9 complexed ...Enhanced CRISPR/Cas9-mediated precise genome editing by improved design and delivery of gRNA, Cas9 nuclease,...target site. With the widespread adoption of CRISPR/Cas9 technology and rapid improvements in the field, ...set out to develop a hassle-free, highly efficient Cas9 protein-based method for epitope tagging in mammalian...genes at a time using Custom Synthetic cr:tracrRNA/Cas9 Ribonucleoprotein (csRNP) delivery Epitope tagging...delivery of three reagents to cells: a guide RNA, Cas9 protein, and a donor DNA that contains the tag sequence...annealed cr:tracrRNA is then mixed with recombinant Cas9 protein to form the ribonucleoprotein complex (csRNP...

  18. Generating Mouse Models Using CRISPR/Cas9

    Type
    Blog Post
    ...alternative Cas9, from Streptococcus aureus, is as effective at editing mouse embryos as Cas9 from S. pyogenes...guest bloggers, Wenning Qin and Haoyi Wang. CRISPR/Cas9 is revolutionizing the mouse gene-targeting field...ever to manipulate the mouse genome using CRISPR/Cas9. Similar to the human genome, the mouse genome ...robust in performance. In its natural setting, CRISPR-Cas9 is an acquired immune system in bacteria and archaea...) of about 125 nt that specifies the target, the Cas9 endonuclease that creates the DNA double-strand ...model basics To create a mouse model, the gRNA, Cas9, and donor oligonucleotide or plasmid components...AAV can also be used as a vector to deliver CRISPR/Cas9 either through injection into either an oocyte or...

  19. CRISPR 101: Targeting Non-Coding RNAs with CRISPR/Cas9

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    Blog Post
    ...powerful tools. CRISPRi uses a nuclease-dead Cas9 protein (dCas9) and a sgRNA to temporarily block the transcription...protein-coding genes thanks to systems like CRISPR/Cas9 that allow them to manipulate full genes and observe...system that can be tweaked to target ncRNA. CRISPR/Cas9 techniques and targeting methods Knock-out: Targeting...Targeting short vs. long ncRNAs The CRISPR/Cas9 system is often used to knock-out, or permanently disable... Knock-in: Introducing tags or stop signals Once Cas9 generates double-strand breaks, a new DNA sequence... Figure 1: A schematic illustration of CRISPR/Cas9-based approaches to study ncRNAs. (A) Transcription...CRISPR systems for targeting ncRNAs While CRISPR/Cas9 has proven to be an extremely useful system for ...

  20. Mapping the 4D nucleome with CRISPR/Cas9

    Type
    Blog Post
    ... a colorful Cas9 toolbox, Ma et al. turned to SpCas9 and its orthologs NmCas9 and St1Cas9. Each ortholog...states. dCas9 gets a colorful makeover Even without its nuclease activity, catalytically dead Cas9 (dCas9... colorful system that uses fluorescently labeled Cas9 to label multiple genomic loci in live cells. While...hybridization (FISH) or fluorescently labeled TALEs, CRISPR/Cas9’s ease of use and ability to label live cells make... chromatin organization. This fluorescent CRISPR/Cas9-based method is a great step forward in live cell...As this study joins the pantheon of useful CRISPR/Cas9 techniques, we at Addgene are excited to see what... crispr/cas9...
Showing: 41 - 60 of 304 results